Flue-cutter.



PATENTED MAR. 17, 1903.:

E. E. RESOB.

FLUE CUTTER.

APPLICATION FILED FEB. 26. 1902.

N0 MODEL.

WITNESSES By W ATTORNE 78 1a., WASnm UNITED STATE PATENT OFFICE.

EDWARD E. RESOR, OF VANWERT, OHIO.

FLU E-CUTTER.

SPECIFICATION forming part-of Letters Patent No. 723,025, dated March 17, 1903.

Application filed February 26, 1902. Serial No. 95,711. No model.)

To rtZZ whom it may concern.-

Be it known that I, EDWARD E. RESOR, a citizen of the United States, and a resident of Vanwert, in the county of Vanwert and State of Ohio, have inventeda new and Improved Flue-Cutter, of which the following.

invention and then point out the novel features in the appended claim.

Reference is to be hadto the accom panyin g drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in both figures.

Figure 1 is a longitudinal section of afiuecutter embodying my invention, and Fig. 2 is a section on the line as w of Fig. 1.

This cutter is operated or forced through the metal of the tube by the action of airpressure, and it therefore comprises a cylinder 1, in which a piston 2 operatesrand to prevent damage to the piston at the ends of its stroke or to the cylinder-heads I place against the inner surface of each head a cushion 3, of rubber or, the like. From 'a valve-casing 4 port-tubes 56 lead into opposite ends of the cylinder. The valvecasing 4 has an inlet 7 for compressed air and-an exhaust 8. valve 9 isarranged to have rocking movement in the casing, so as to direct air into one of the. ports, While the exhaust isthrough the other port and through the exhaust. or'outlet 8. The stem of the valve extends outwardthrough a wall of the casing and hasattached to it an operatinglever 10, which is limited in its movement in.

opposite directions by means of pins 11. Extended from the cylinder is a tube 12, the end of which is designed to be inserted in the flue to be out, and movable radially with relation to thistube 12 are the cutters 13 14. These cutters have stem portions 15, which extend into outwardly-opening slots 16, formed in the opposite sides of the tube 12.

It may be here stated, however, that while I have shown but two cutters a greater number maybe employed. The cutters have a swinging .motion, caused by the lips 15 engaging loosely in recesses in the "tube 12. The valve-stem 17 has a tapered portion 18, the largerdiameterbeingat the outer end, and this tapered portionis designed, by engaging against the inner ends of the cutters, to force said cutters outward when the piston is moved in one direction. After placing the cutters in position in the tube 12 they are held or prevented from dislodgment by means of a collar 19, extending around the tube 12 and secured by any suitable means. I have here shown a set-screw 20 for this purpose. Springs 21, arranged in openings in the collar 19, bear against the shank portions 15 of the cutters and are designed to move the said cutters inward, as will be hereinafter described. The end of the collar 19 is provided with an annular flange 22 for engaging around the flange at the outer end of the flue y and for engaging or forming an abutment against the sheet a.

In operation when the valve-stem is in its outermost position the cutters will be moved inward by means of the springs 21, so that their cutting edges are flush with the outer surface of the tube 12. Then by inserting the end of the tube 12 into the fliie to a'point to bring the cutters against the due at the inner side of the flue-sheet the motive agent is admitted through the tube or port 5. This of course wilr force the piston 2 rearward, and the tapered portion 18 of the valve-stem will force the cutters outward, quickly cutting through the pipe at opposite sides. Then upon reversing the valve- 9 air will be admitted through the tube or port 6, forcing the piston in the opposite direction, the exhaust taking place through the port 5 and the exhaust 8. During this movement the springs 21 will force the cutters inward or toward each other, so that the tool can-be rotated slightly to bring the cutters into new position adjacent to the holes or openings to be made. Then the valve is again turned to cause an operation of the piston to force the cutters outward.

It is obvious that with a tool embodying my invention the cutters are steadily moved outward with contin uous motion, resulting in an even and clean out, while with tools in I which the tapered pin is forced inward by hammer-blows the cutting is intermittent and the cutters are forced lengthwise of the tube, making a ragged cut. It will be noted that the lesser diameter of the stem 18 is toward the piston, and therefore the cutters are moved outward by a drawing movement of the stem, which holds the end of the collar 19 tightly against the flue-sheet, so that the machine practicallyholds itself in place while operating.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- In a flue-cutter, the combination with a cylinder for receiving a motive agent, a piston and a taperedpiston-stem, of a tube extended from one end of the cylinder and in which the stem operates, the said tube having outwardly-opening slots and recesses, cutters having shank portions arranged in said slots and engaged by the piston-stem, lips on said shanks for engaging in the recesses, a collar around the tube, and springs in the collar engaging with the shanks, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of 0 two subscribing witnesses.

EDWARD E. RESOR.

Witnesses:

E. S. MATTHIAS, GEORGE RICE. 

